@media screen and (min-width:1200px) {
  html {
    font-size: 20px;
  }
}

@media screen and (min-width:800px) and (max-width:1200px;

) {
  html {
    font-size: 16px;
  }
}

@media screen and (max-width:800px) {
  html {
    font-size: 12px;
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  font-size: 18px;
  font-family: '楷体';
}

.main {
  display: block;
  margin-top: 4rem;
}

div {
  width: 20rem;
  height: 4rem;
  margin: 0 auto;
  background-color: #00C37E;
  color: white;
  padding-left: 2rem;
  line-height: 4rem;
  font-style: italic;
  position: relative;
  margin-bottom: 0.5rem;
  cursor: pointer;
  opacity: 0.8;
  transition: all .6s;
}

div:hover {
  opacity: 1;
}

div>em {
  width: 0;
  height: 0;
  border: 0.5rem solid white;
  border-bottom: 0.5rem solid rgba(0, 0, 0, 0);
  border-right: 0.5rem solid rgba(0, 0, 0, 0);
  border-left: 0.5rem solid rgba(0, 0, 0, 0);
  position: absolute;
  top: 1.5rem;
  left: 18rem;
}

.container {
  width: 20rem;
  height: 15rem;
  overflow-y: auto;
  margin: 0 auto;
  color: #606266;
  border: 0.05rem solid #909399;
  line-height: 2rem;
  padding-left: 1rem;
  margin-bottom: 0.5rem;
}